I pressurized my system to 15 psi when I filled my boiler. When fully heated (190 degrees) the pressure would go to 20-22 psi. Now that I am firing less I notice the cold pressure goes down to 5 psi or even 0 if I have not fired for a week. Once I fire the pressure goes back up to 15 or so. Is this normal?
Thanks
Terry
Thanks
Terry